Nano-organic carbon and soot particle measurements in a laminar ethylene diffusion flame


D'Anna A., Rolando A., Allouis C. G. , Minutolo P., D'Alessio A.

PROCEEDINGS OF THE COMBUSTION INSTITUTE, cilt.30, ss.1449-1456, 2005 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 30
  • Basım Tarihi: 2005
  • Doi Numarası: 10.1016/j.proci.2004.08.276
  • Dergi Adı: PROCEEDINGS OF THE COMBUSTION INSTITUTE
  • Sayfa Sayıları: ss.1449-1456

Özet

The formation of carbonaccous particulates in a co-flow laminar diffusion flame has been studied using UV-visible spectroscopy and laser scattering/extinction techniques for measurements of volume fractions and particle sizes. Measurements were performed in a non-smoking ethylene-air flame at atmospheric pressure. UV-visible spectroscopy allowed the identification of two classes of particles: soot particles, which absorb light in the whole spectral range and nano-organic carbon particles (NOC) which are transparent to the visible radiation. The mean size of nano-organic carbon particles was estimated to be about 2-3 nm. This agreed with previous results obtained in rich premixed flames with equivalence ratios across the soot formation threshold. The experimental results indicate that nano-organic carbon particles are formed in the fuel side of the flame front closer to the flame centre line than soot particles and with a concentration level comparable to that of soot. The intermediate spatial location of these particles between the fuel- and soot-containing regions and their high concentration in flame suggest that soot formation is just the consequence of coagulation of NOC particles without a major role of surface growth in the soot loading process. (c) 2004 The Combustion Institute. Published by Elsevier Inc. All rights reserved.